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Recyclage / recycling and upcycling. Vidéos Pearltrees. CNC / Fraiseuses numériques. Wood / Bois. Intro to Stepper Motors. Who could need more than two wires and an H-bridge?

Why? Well, unlike common brushed DC motors built for maximum RPM (or kV for the RC folk), stepper motors are brushless motors designed for high torque (subsequently lower speed) and higher precision rotational movement. Whereas a typical DC motor is great for spinning a propeller at high speed for maximum thrust, a stepper is better suited to rolling a sheet of paper in sync with an inkjet mechanism inside of a printer, or carefully spinning the shaft of a linear rail in a CNC mill. Internally, stepper motors are more complex than a simple DC motor, having multiple coils around a permanent magnet core, but with this added complexity comes greater control. Through a careful arrangement of coils built into the stator, the rotor of a stepper motor can be made to rotate a set step by varying the polarity across the coils and switching their polarity in a set firing pattern.

The answer is yes! I met up with Kate Bradbury, BBC wildlife expert and author of the The Wildlife Gardener, to find out what you can do for bees in a small urban space like a balcony, a few window sills or a small patch of concrete. Bees in cities commonly have a shortage of both of food and nesting places, says Kate. You can help by growing flowers (Kate recommends some good ones for bees below) and by making a home for solitary bees (watch how in the video). If you’re wondering how you can make your bee hotel look more beautiful than the one I made in the video (!)

Create a solitary bee home You may be wondering, like I was, if insect homes actually work. According to Kate, although some can be gimmicky, solitary bee homes definitely do. In the video below, she explains why solitary bees are in desperate need of more nesting places in the city. Choose the right flowers for bees Your turn. Open Making. Opendesk uses cookies.

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